57.3 is to convert the results from radians to degrees. It's 180/Pi
My results for latitude 30.22749 (N) is 34° (rounded) north of West. Not sure what happened. You can PM me if you'd like or I can send you my Excel spreadsheet.
I made the trip to the ocean at Panama City Beach on the FL panhandle. I looked up the predicted sunset time and direction from timeanddate.com (RE math) and took the prediction from the FE formula listed in the above thread.
Two caveats.
1: The FE formula was specific to the seasonal equinox dates, so it only works two days a year. I was not there on the fall equinox, although I was only off by a few days. The photos posted below were taken at sunset on September 12, 2017, ten days before the equinox. So I would expect that the result might shift by a few degrees.
2: I intended to take the magnetic declination into account. But once I looked it up, I found that it was only 3 degrees. Since I was working with a handheld compass, that small of a declination was not really a factor.
For that date and location, RE math (via timeanddate.com) predicted a sunset at 6:51pm CDT at a compass heading of 275 degrees.
FE math (see caveat above) predicted a sunset at compass heading of 326 degrees. This is towards the northwest which is about what I would expect looking at the FE animations.
My observation was that the sunset happened precisely at the time and direction according to RE math (via timeanddate.com). I found it difficult to have proper exposure and focus on the sunset and compass in the same frame. So in the pictures below you can two shots. In one you can see the sunset and a post on the beach, a volleyball net post I think. The post roughly points towards the sunset. in the second picture you can see my compass resting on the balcony pointing towards magnetic north. If you zoom in on the compass, you can see the sunset is at 275 degrees. The post in both pictures can used to judge the alignment.
The direction predicted by FE math (326 degrees) can not be seen in the picture. In order to view the sky at that angle I had to go through the condo and stand on the front side of the building.
Clearly, the FE equation doesn't remotely match observations made directly by the human eye. And the RE math does.
I have seen some posts by Tom Bishop asking for proof that timeanddate.com use a round Earth model. As if he assumes they must have some disclaimer or something indicating what model of the Earth they believe in. The expectation to find an answer to that question on their website is absurd. However, it is plain by browsing some of their site and back issues of their newsletters that they believe the Earth to be round and to be found orbiting the sun.
How does anyone take the flat Earth model seriously when it can't predict basic things we can see with our own eyes?